package com.heima.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.heima.model.common.dtos.ResponseResult;
import com.heima.model.common.enums.AppHttpCodeEnum;
import com.heima.model.search.dtos.UserSearchDto;
import com.heima.model.user.pojos.ApUser;
import com.heima.search.service.ApUserSearchService;
import com.heima.search.service.ArticleSearchService;
import com.heima.utils.thread.AppThreadLocalUtil;
import lombok.SneakyThrows;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.StringUtils;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.scheduling.annotation.Async;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;

@Service
@Slf4j
public class ArticleSearchServiceImpl implements ArticleSearchService {

	//RestHighLevelClient类在引导类中已经定义
	@Autowired
	private RestHighLevelClient restHighLevelClient;

	@Autowired
	private ApUserSearchService apUserSearchService;

	/**
	 * es文章分页检索
	 * @param dto
	 * @return
	 */
	@SneakyThrows//注解允许你在方法中抛出受检查的异常，而无需显式地声明throws或使用try-catch块
	@Override
	@Async//异步
	public ResponseResult search(UserSearchDto dto) {

		//1.检查参数
		if(dto == null || StringUtils.isBlank(dto.getSearchWords())){
			return ResponseResult.errorResult(AppHttpCodeEnum.PARAM_INVALID);
		}

		ApUser user = AppThreadLocalUtil.getUser();

		//异步调用 保存搜索记录
		if(user != null && dto.getFromIndex() == 0){
			apUserSearchService.insert(dto.getSearchWords(), user.getId());
		}

		//2.设置查询条件
		SearchRequest searchRequest = new SearchRequest("app_info_article");
		SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();

		//布尔查询
		BoolQueryBuilder boolQueryBuilder = QueryBuilders.boolQuery();

		//关键字的分词之后查询
		QueryStringQueryBuilder queryStringQueryBuilder = QueryBuilders.queryStringQuery(dto.getSearchWords()).field("title").field("content").defaultOperator(Operator.OR);
		boolQueryBuilder.must(queryStringQueryBuilder);

		//查询小于mindate的数据
		RangeQueryBuilder rangeQueryBuilder = QueryBuilders.rangeQuery("publishTime").lt(dto.getMinBehotTime().getTime());
		boolQueryBuilder.filter(rangeQueryBuilder);

		//分页查询
		searchSourceBuilder.from(0);
		searchSourceBuilder.size(dto.getPageSize());

		//按照发布时间倒序查询
		searchSourceBuilder.sort("publishTime", SortOrder.DESC);

		//设置高亮  title
		HighlightBuilder highlightBuilder = new HighlightBuilder();
		highlightBuilder.field("title");
		highlightBuilder.preTags("<font style='color: red; font-size: inherit;'>");
		highlightBuilder.postTags("</font>");
		searchSourceBuilder.highlighter(highlightBuilder);


		searchSourceBuilder.query(boolQueryBuilder);
		searchRequest.source(searchSourceBuilder);
		SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);


		//3.结果封装返回

		List<Map> list = new ArrayList<>();

		SearchHit[] hits = searchResponse.getHits().getHits();
		for (SearchHit hit : hits) {
			String json = hit.getSourceAsString();
			Map map = JSON.parseObject(json, Map.class);
			//处理高亮
			if(hit.getHighlightFields() != null && hit.getHighlightFields().size() > 0){
				Text[] titles = hit.getHighlightFields().get("title").getFragments();
				String title = StringUtils.join(titles);
				//高亮标题
				map.put("h_title",title);
			}else {
				//原始标题
				map.put("h_title",map.get("title"));
			}
			list.add(map);
		}

		return ResponseResult.okResult(list);

	}
}
